Prof. Dale E. Gary
Imaging the Solar Eclipse
Prob. 3.1: In Lecture 3, we gave the equation for plate scale, and an example of how to calculate the linear size of an object at the focal plane of a telescope. For the 2017 August 21 total solar eclipse, I used an 80 mm f/6 telescope and the ZWO ASI120 camera, whose specifications are listed in the table below. (Use the fact that 1 degree = 60 arcmin = 3600 arcsec.)
a. What is the plate scale (in mm/degree) for this telescope?
b. What is the angular size, in arcsec, that one pixel of this camera would represent?
c. What is the field of view of the camera, horizontally and vertically, in arcminutes?
d. Will the Sun (angular size 1/2 degree) fit in the camera frame horizontally? Vertically?
|Color or Monochrome Camera?||Color|
|Imaging Camera Series||ZWO ASI120|
|Pixel Size (µm)||3.5 x 3.5|
|Pixel Array (pixels)||1280 x 960|
|Camera Cooling||Natural Convection|
|CCD Architecture||Frame Transfer|
|Minimum Exposure||64 microsecond|
|Maximum Exposure||1000 seconds|
|Software Included||Windows Camera Driver, ASCOM Driver, SharpCap, FireCapture, Stakkert 2|
|Computer Interface||USB 3.0|
|Includes Filter Wheel?||No, Sold Separately|
|Camera Dimensions||2.44 x 1.1 inch|
|Camera Weight (lb.)||0.22|
|Camera Warranty||1 year|